Opera switched browser engines from Opera Presto to Opera Blink. The last version of Opera Presto is 12.17. Opera Blink started at version 15, and is now at Opera 21 (for a stable version). Opera permits a download of both Opera Presto and Opera Blink from its website. If you have Opera 12.17, it will, I understand, not update to Opera Blink. Now Opera is committed to working on Opera Blink. It is not working on Opera Presto anymore. That browser (Presto), while it has many wonderful features is a bit outdated, and has trouble rending some sites. Opera blink is faster, renders sites better, and is more a minimalist browser (with basic functions)as well as certain wonderfully unique features (a Speed dial where you can add folders of urls/landmarks for each position of the dial)(there is no browser on the internet with Speed Dial quite like this one), Stash, a Discover feature, Off Road Mode, and more. In Opera 21, most customization is gotten through extensions. With one Opera Extension, "Download Chrome Extension," Opera 21 users can download and install almost any extension in the Chrome store. And there are a lot of amazing customization opportunities there! Of course, extensions in the Opera store are also still available. Instead of bundling features in the new Opera 21 browser (many of which most users might never user), Opera is opting for providing generally basic features in this leaner, faster browser, as well as some of the new super creative extras (like the wonderful Speed Dial) and letting users decide which add-ons they want to install on their browser to provide the necessary customization. And you can stay with Opera 12.17 (because you may like features there that cannot be completely replicated in Opera 21 even with extensions), or install Opera 21 (and with extensions end up doing more in some areas than you could ever have done before with Opera 12.17. You can even download Opera 21, and use it and Opera 12.17 simultaneously until you can decide which you prefer.
Here's a link to Opera 21 for download. http://blogs.opera.com/desktop/2014/05/opera-21-desktop-released-aura-powered/
Now I understand. Thanks so much for the reply!